BUTTON BATTERY

A button battery, comprising a pole assembly unit which comprises a first winding core, a first tab, and a first current collector; the first winding core comprises a first electrode layer, a second electrode layer, and a first separator sandwiched between the adjacent first electrode layer and second electrode layer, the polarities of the first electrode layer and second electrode layer being opposite to each other. The button battery also comprises a battery housing, a battery cover, and an insulating sealing ring; the battery housing forms a sealed cavity with the battery cover by means of the sealing ring; an electrolyte is stored within the sealed cavity; the pole assembly unit is disposed within the sealed cavity; and the first electrode layer is electrically connected to the battery cover by the first tab, and the second electrode layer is electrically connected to the battery housing by the first current collector.